Allenspark is a community in Boulder County, Colorado, home to about 825 people across 12 square miles. Its ZIP code is 80510, and parts of 80540 are in Allenspark too.
Homes sold for a median of $496 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Allenspark
Mostly Lyons; part is in Allenspark
Each card is that ZIP code’s whole market, including any part outside Allenspark. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Allenspark’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Denver International Airport (DEN)49 miles away |
|---|---|
| Closer regional airport | Rocky Mountain Metropolitan Airport (BJC)29 miles away |
| Nearest city of 250,000+ | Denver, CO45 miles away |
| Nearest city of 1 million+ | Phoenix, AZ588 miles away |
Straight-line distances from the center of Allenspark; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Allenspark had 568 residents in the 2020 census, up 15% since 2000.
It’s the 242nd largest of 472 towns in Colorado by population.
Boulder County grew from 21,544 residents in 1900 to 330,758 in 2020.
Boulder County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 80°F in summer, and winter lows average 16°F. About 17.6 inches of rain and melted snow fall in a typical year, with about 104 inches of snow.
Source: NOAA 1991–2020 climate normals, Estes Park 3 Sse, CO weather station (9 miles away).
159,619 jobs at 12,990 businesses in Boulder County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in Allenspark.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Mental health providers | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
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Shares ZIP codes with Lyons.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.